Non coeliac gluten sensitivity

Overview

Non-coeliac gluten sensitivity (NCGS) is a condition where people get uncomfortable symptoms after eating foods that contain gluten — a protein found in wheat, barley, and rye. Unlike coeliac disease (an autoimmune disorder) or a wheat allergy (an allergic reaction), NCGS does not damage the gut or trigger an immune or allergic response. The symptoms are real, but the cause is not yet fully understood.

It is not as common as these estimates may suggest, but some studies indicate that NCGS may affect up to 6% of the population. However, the actual number is uncertain because many people self-diagnose and go on a gluten-free diet without proper medical evaluation.

It can affect people of any age, gender, or background. It is more often reported in women and in people in their 30s and 40s, but this may be due to who seeks medical help.

Symptoms

Common symptoms

• Bloating and gas
• Abdominal pain or cramps
• Diarrhoea or constipation
• Nausea
• Feeling overly tired (fatigue)
• Headaches
• ‘Brain fog’ — trouble concentrating or thinking clearly
• Joint or muscle aches
• Numbness or tingling in the hands or feet
• Skin rash (eczema-like)

Symptoms in children

• Stomach pain or bloating
• Diarrhoea or constipation
• Poor appetite or slow growth
• Irritability or mood changes
• Being very tired

Symptoms in older adults

• Bloating, diarrhoea, or constipation
• Unintentional weight loss
• Weakness or fatigue
• Nutritional deficiencies (e.g., iron deficiency anaemia)
• Confusion or memory problems that may be mistaken for early dementia

Causes

Main causes

• The exact cause is unknown. It is not an allergy or an autoimmune condition.
• Some researchers think that other parts of wheat (not just gluten), called FODMAPs, might cause symptoms in some people.
• The immune system may be involved in a different way than in coeliac disease.

Risk factors

• Having other conditions such as irritable bowel syndrome (IBS)
• Family history of gluten-related conditions (though this is less clear than for coeliac disease)
• Being a woman (more women report NCGS, but the reason is not known)

When to see a doctor

See a doctor urgently if:

• If you have severe abdominal pain or vomiting that prevents you from eating or drinking

Book a routine appointment if:

• If you regularly have symptoms like bloating, diarrhoea, or fatigue that you think may be linked to eating gluten
• If you have unintentional weight loss
• Before starting a gluten-free diet — it is important to get a proper diagnosis first

Diagnosis

There is no single test for NCGS. The diagnosis is made by first testing for coeliac disease and wheat allergy and ruling them out. Then, if your symptoms improve when you stop eating gluten and return when you start eating gluten again, your doctor may diagnose NCGS. This process must be done under medical supervision so that tests for coeliac disease are accurate (you must be eating gluten for those tests).

Tests that may be done

• Blood tests to check for coeliac disease (tissue transglutaminase antibodies)
• Blood test for wheat allergy (IgE antibodies)
• If coeliac disease is suspected, a biopsy of the small intestine may be done
• A food and symptom diary to track what you eat and how you feel
• A gluten challenge — eating gluten again under medical guidance to see if symptoms return

What to expect at your appointment

The process can take several weeks or months. You may be asked to eat gluten-containing foods for a period, then remove them, then possibly reintroduce them. A dietitian can help you follow a gluten-free diet correctly and avoid nutritional gaps.

Treatment

The main treatment for NCGS is a gluten-free diet. This means avoiding all foods that contain wheat, barley, and rye. Many people feel better within days or weeks of starting the diet. In some cases, symptoms may come back when gluten is reintroduced, so you may need to stay on the diet long-term.

Self-care at home

• Follow a gluten-free diet. Learn to read food labels carefully
• Work with a dietitian to ensure your diet is balanced and includes enough fibre, vitamins, and minerals
• Keep a symptom diary to track what helps or worsens your symptoms
• Avoid processed gluten-free products that may be high in sugar and fat; focus on whole foods like fruits, vegetables, lean proteins, and naturally gluten-free grains
• Consider whether other foods, such as certain FODMAPs, also trigger your symptoms — your doctor or dietitian can help

Medical treatments

There are no specific medications approved for NCGS. In some cases, if symptoms like bloating or diarrhoea are severe, your doctor may suggest medications to manage those symptoms, but there is no drug that treats the condition itself. Always discuss any treatment with your healthcare provider.

When is surgery considered?

Surgery is not a treatment for NCGS.

Living with this condition

Living with NCGS means being mindful of what you eat every day. You may need to check ingredients in packaged foods, ask questions when eating out, and prepare meals at home more often. Many people find that their quality of life improves once they identify and avoid the foods that cause symptoms.

Lifestyle tips

• Plan meals ahead to avoid accidental gluten exposure
• Carry safe snacks when travelling or dining out
• Tell friends and family about your dietary needs so they can support you
• Join a support group, either in person or online, to share experiences and tips

Diet and exercise

A gluten-free diet can be healthy if it includes a variety of whole foods like vegetables, fruits, lean meats, fish, eggs, nuts, seeds, and gluten-free grains (rice, quinoa, corn). Regular exercise is good for overall health, including digestion and stress management. If you have fatigue, start with gentle activities like walking or yoga.

Mental health and emotional wellbeing

NCGS can affect your mood and mental health because of ongoing symptoms and the social challenges of a restrictive diet. Some people feel anxious about eating away from home or frustrated with the limitations. It is normal to feel this way, and talking to a counsellor or joining a support group can help. If you experience thoughts of self-harm or suicide, reach out to a crisis helpline immediately.

Prevention

There is no known way to prevent NCGS. It is not entirely clear why some people develop it. The focus is on managing symptoms rather than preventing the condition from starting.

Complications

If left untreated

• Ongoing discomfort and reduced quality of life
• Nutritional deficiencies if symptoms cause poor absorption or if you avoid foods without proper planning
• Unnecessary anxiety or misdiagnosis of other conditions

Long-term outlook

The outlook for people with NCGS is very good. Once the gluten-containing foods are identified and removed from the diet, most people feel much better. The condition does not cause permanent damage to the gut or increase the risk of other health problems. With the right support, you can lead a healthy and active life.

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